Answer:
B) it reacts with sodium metal to form sodium hydroxide and hydrogen gas
Explanation:
B is the only option that show a chemical property, density, freezing, and boiling points are physical properties.
Answer:
Only gives spontaneous reaction.
Explanation:
A redox reaction will be spontaneous if standard reduction potential () of the reaction is positive. Because it leads to negative standard gibbs free energy change (), which is a thermodynamic condition for spontaneity of a reaction.
Where and represents standard reduction potential of reduction half cell and standard reduction potential of oxidation half cell.
(1) Oxidation: ;
Reduction: ;
So,
Hence this pair will give spontaneous reaction.
(2) Similarly as above,
Hence this pair will give non-spontaneous reaction.
(3) Similarly as above,
Hence this pair will give non-spontaneous reaction.
(4) Similarly as above,
Hence this pair will give non-spontaneous reaction.
The relative atomic mass of element X is 41.4 amu while the relative atomic mass of the second element is 162.3 amu
The questions are incomplete, the complete questions are;
1) Element X has three naturally occurring isotopes. The mass (amu) and % abundance of the isotopes are 37.919 amu (5.07%), 39.017 amu (15.35%), and 42.111 amu (79.58%). What is the average atomic mass of element X?
2) A certain element has three isotopes. The isotopic masses and abundances are: 159.37 amu (30.60%), 162.79 amu (15.79%), and 163.92 amu (53.61%). What is the average atomic weight of the element?
We can obtain the average atomic mass the the sum of the products of relative abundance and isotope mass for all the isotopes of the element.
Note that isotopes of an element has different masses and abundances. The average atomic mass of the element includes contribution from all these isotopes.
1) (37.919 × 0.0507) + (39.017 × 0 .1535) + (42.11 × 0.7958) = 41.4 amu
2) (159.37 × 0.3060) + (162.79 × 0.1579) + (163.92 ×0 .5361) = 162.3 amu
Learn more: brainly.com/question/13214440
Answer:
50 g NaOH
General Formulas and Concepts:
<u>Chemistry - Solutions</u>
- Reading a Periodic Table
- Using Dimensional Analysis
- Molarity = moles of solute / liters of solution
Explanation:
<u>Step 1: Define</u>
0.500 L
2.50 M NaOH
x moles of solute
<u>Step 2: Define conversions</u>
Molar Mass of Na - 22.99 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of NaOH - 22.99 + 16.00 + 1.01 = 40 g/mol
<u>Step 3: Find moles of solute</u>
2.50 M NaOH = x moles NaOH / 0.500 L
x = 1.25 moles NaOH
<u>Step 4: Convert</u>
<u /> = 50 g NaOH
<u>Step 5: Check</u>
<em>We are given 3 sig figs. Since our final answer has 2 sigs, there is no need to round.</em>
Without the answer choices it is tough but here is what I can tell you.
<span>EPA, NRC, and OSHAEPA, NRC, and OSHA.</span>